avoirdupois pound to kilogram
Convert avoirdupois pound (lb) to kilogram (kg). Use an editable mass converter, conversion formula, and reference table.
1 lb = 0.45359237 kg
Conversion formula
One avoirdupois pound equals 0.45359237 kilogram. Multiply your value in avoirdupois pound by this factor to get kilogram. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 avoirdupois pound:5 × 0.45359237 = 2.26796185 kg
Conversion table
| avoirdupois pound (lb) | kilogram (kg) |
|---|---|
| 0.01 | 0.0045359237 |
| 0.1 | 0.045359237 |
| 1 | 0.45359237 |
| 2 | 0.90718474 |
| 5 | 2.26796185 |
| 10 | 4.5359237 |
| 25 | 11.33980925 |
| 50 | 22.6796185 |
| 100 | 45.359237 |
| 1000 | 453.59237 |
About these measurements
Mass quantifies an amount of matter.
The base reference used here is the gram. One avoirdupois pound is 453.59237 base units; one kilogram is 1,000 base units.
Important distinctions
Mass is not force. Avoirdupois ounces and troy ounces have different masses.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert lb to kg?
Multiply the quantity in lb by 0.45359237. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the kilogram to avoirdupois pound converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
